Add long explanation for E0549
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@ -290,6 +290,7 @@ E0543: include_str!("./error_codes/E0543.md"),
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E0545: include_str!("./error_codes/E0545.md"),
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E0546: include_str!("./error_codes/E0546.md"),
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E0547: include_str!("./error_codes/E0547.md"),
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E0549: include_str!("./error_codes/E0549.md"),
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E0550: include_str!("./error_codes/E0550.md"),
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E0551: include_str!("./error_codes/E0551.md"),
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E0552: include_str!("./error_codes/E0552.md"),
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@ -608,9 +609,6 @@ E0781: include_str!("./error_codes/E0781.md"),
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// E0540, // multiple rustc_deprecated attributes
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E0544, // multiple stability levels
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// E0548, // replaced with a generic attribute input check
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// rustc_deprecated attribute must be paired with either stable or unstable
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// attribute
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E0549,
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E0553, // multiple rustc_const_unstable attributes
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// E0555, // replaced with a generic attribute input check
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// E0558, // replaced with a generic attribute input check
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@ -0,0 +1,37 @@
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The `rustc_deprecated` attribute must be paired with either `stable` or
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`unstable`.
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Erroneous code example:
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```compile_fail,E0549
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#![feature(staged_api)]
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#![stable(since = "1.0.0", feature = "test")]
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#[rustc_deprecated(
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since = "1.0.1",
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reason = "explanation for deprecation"
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)] // invalid
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fn _deprecated_fn() {}
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```
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To fix this issue, you need to add also an attribute `stable` or `unstable`.
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Example:
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```
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#![feature(staged_api)]
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#![stable(since = "1.0.0", feature = "test")]
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#[stable(since = "1.0.0", feature = "test")]
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#[rustc_deprecated(
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since = "1.0.1",
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reason = "explanation for deprecation"
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)] // ok!
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fn _deprecated_fn() {}
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```
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See the [How Rust is Made and “Nightly Rust”][how-rust-made-nightly] appendix
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of the Book and the [Stability attributes][stability-attributes] section of the
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Rustc Dev Guide for more details.
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[how-rust-made-nightly]: https://doc.rust-lang.org/book/appendix-07-nightly-rust.html
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[stability-attributes]: https://rustc-dev-guide.rust-lang.org/stability.html
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@ -116,5 +116,5 @@ LL | #[rustc_deprecated(since = "a", reason = "text")]
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error: aborting due to 19 previous errors
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Some errors have detailed explanations: E0539, E0541, E0542, E0543, E0546, E0547, E0550.
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Some errors have detailed explanations: E0539, E0541, E0542, E0543, E0546, E0547, E0549, E0550.
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For more information about an error, try `rustc --explain E0539`.
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